NO need for a smoke switch in these trucks, so there is no need for us to tell you how to make one.
As said above - smoke is unburned fuel, and wasted power. It is useless, and it is not "cool". It makes EVERYONE who drives a diesel look bad when it is done for no reason. We don't need anymore bad press. Public opinion of us does matter
Regardless of what the facts about pollution are, the more we run around town smoking people out the more restrictions we'll see in the future. Please don't blow smoke for no reason. You want to impress me? get your 7.3 in the 12's
The only time a truck should be smoking is at the track or on the rollers or at a sled pull.